IC FOR PROXIMITY DETECTOR
GENERAL DESCRIPTION
AM 313
The AM 313 is a bipolar monolithic Integrated Circuit designed for proximity detection appli-
cations. The function is based on the damping of an LC oscillator which switches a transistor and
LED output.
FEATURES
•
•
•
•
•
•
•
•
•
•
Wide Supply Voltage Range from 4.75 to 35V
Supply Current Without Oscillator typical 1mA
Complementary Outputs with Short–Circuit Protection
P–Type Drivers for PNP Bipolar and PMOS Transistors
Adjustable Output Current From 100µA to 12mA
Adjustable Detection Distance and Hysteresis
Adjustable Temperature Compensation for Detection Distance
Protection against False Polarity
Power–On–Delay
LED Output 4mA typical
BLOCK DIAGRAM
VCC
CABT
14
Power-On
Level
5
VREF
RK
LC
RD
RH
7
2
1
16
15
Hysteresis
Oscillator
Voltage
Reference
Power-On
Delay
Short-Circuit
Detection
11
10
9
8
RM
Q
Q
RS
Rectifier
Schmitt
Trigger
Amplifier
Output
Stages
Drive
Current
LED
4
Figure 1
CGL
3
LED
6
GND
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: www.analogmicro.de
Phone: +49 (0)6131/91 073 – 0
Fax:
+49 (0)6131/91 073 – 30
E–Mail: info@analogmicro.de
April 2005
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IC FOR PROXIMITY DETECTOR
ELECTRICAL SPECIFICATIONS
T
amb
= 25°C,
V
CC
= 4.75 to 35 V
Parameter
Supply Current
Symbol
I
CC
Conditions
V
CC
= 4.75V,
I
Rd
= 0µA
V
CC
= 4.75V,
I
Rd
= 220µA
V
CC
= 35V,
I
Rd
= 0µA
Output Source Current
Output Sink Current
Max. Current
Low Output Voltage
High Output Voltage
LED Output Current
Current Short Circuits
I
QL
(res.
I
Q
)
I
QL
I
QL
=
f
(R
S
)
U
QL
U
Q
(res.
U
Q
)
I
LED
I
ON
I
OFF
V
Cabt
= 2V,
V
Rm
= 1V
V
Cabt
= 1V,
V
Rm
= 1V
V
Cabt
= 2V,
V
CC
= 35V
without external
R
S
R
S
= 5Ω
I
ext
= 100 µA
V
Cgl
= 2V,
V
CC
= 4.75V
Min.
0.6
1.2
0.8
100
100
12
0.6
4.45
2.8
250
50
–1.7
4
300
80
–1.2
Typ.
0.9
1.5
1.1
150
150
18
0.9
AM 313
Max.
1.2
1.8
1.5
200
200
1.2
4.75
350
150
–0.7
Unit
mA
mA
mA
µA
µA
mA
V
V
mA
mV
µA
µA
Short Circuit Detection Threshold
U
m
TYPICAL PERFORMANCE CHARACTERISTICS
V
CC
= 5V
Parameter
Scanning Duty Cycle
(in Short Circuit Mode)
T
OFF
T
OFF
/T
ON
Power–On–Delay
Oscillator Frequency
Oscillator Amplitude
Detection Frequency
Detection Distance Res.
Hysteresis Resistor
Det. Distance Temp. Comp. Res.
Rectifier Filter Capacitor
T
abt
f
Osc
V
Osc
f
det
R
d
R
h
R
k
Cgl
ext
R
h
>>
R
d
external
depends on
f
Osc
(Cgl
int
= 150pF)
0
0
150
(f
Osc
= 770kHz,
Q
= 16)
3
30
1.4
Symbol
T
ON
Conditions
C
abt
= 0nF,
U
m
= 1V
C
abt
= 1nF,
U
m
= 1V
C
abt
= 0nF,
U
m
= 1V
C
abt
= 1nF,
U
m
= 1V
C
abt
= 0nF
C
abt
= 1nF
C
abt
= 0nF
C
abt
= 1nF
depends on
LC
res.
0.05
1.2
5
Min.
Typ.
4
21
350
2.0
90
100
380
2.3
2.6
2
µs
ms
MHz
Vpp
kHz
kΩ
kΩ
kΩ
pF
Max.
Unit
µs
µs
µs
ms
analog microelectronics
April 2005
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IC FOR PROXIMITY DETECTOR
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
V
CC
Output Voltage
U
Q
Output Current
I
QL
Junction Temperature
T
J
Power Dissipation at
T
amb
= 25°C
Derate for
T
amb
> 25°C
Storage Temperature Range
T
st
Operating Temperature Range
T
amb
T
amb
35V
32V
20mA
150°C
P
D
= 600mW
1/R
Θ
= 5mW/°C
– 55...125°C
– 25...85°C (V
CC
= 15V to 35V)
– 20...85°C (V
CC
= 4.75V to 35V)
AM 313
FUNCTIONAL DESCRIPTION
The proximity detection is based on the amplitude attenuation of an
LC–oscillator
which depends
on the distance to a metal object.
The signal from the oscillator is rectified and filtered, then detected by a Schmitt–Trigger which
switches the outputs
Q
(for close switch operation) and
Q
(for open switch operation).
An additional LED output shows the on-state of the detection. The LED is blanked in the case of
short circuit. To protect the circuit from overload, the outputs are disconnected and retested
periodically. The limitation of the output current is set by the resistor
R
m
.
The temperature compensation to adapt the oscillator voltage to different types of external LC
resonators is performed by connecting a resistor between pins 7 (VREF) and 2 (RK).
The circuit has a power–on–delay which is adjusted with
CABT.
Within this delay, the outputs
Q
and
Q
are set to high level.
FUNCTIONAL DIAGRAMS
V
CC
VREF
7
14
VCC
3
LED
11
R
m
Z
2
10
9
R
K
2
1
AM313
R
H
15
Q
Q
T
D
1
Output
Z
1
C
R
Ground
L
16
C
OSC
R
D
6
5
4
8
R
S
D
2
Figure 2
analog microelectronics
April 2005
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IC FOR PROXIMITY DETECTOR
PINOUT
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
LC
RK
LED
CGL
CABT
GND
VREF
RS
Q
AM 313
DESIGNATION
Resonator Input
Detection Distance Temp. Comp.
LED Driver
Rectifier Filter Capacitor
Power–On–Delay Adjust Cap.
Ground
Reference Voltage Output
Output Transistor Current Adjust
Output
Q
(open switch)
Output
Q
(closed switch)
Short Circuit Detection Input
Not Connected
Not Connected
Positive Supply Voltage
Hysteresis Adjust
Detection Distance Adjust
LC
RK
LED
CGL
CABT
GND
VREF
RS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RD
RH
VCC
NC
NC
RM
Q
Q
Q
RM
NC
NC
VCC
RH
RD
Figure 1
DELIVERY
The AM 313 is available in version:
•
16–pin–DIL packages (samples)
•
SO 16 (n)–packages
•
dice on 5“ blue foil
analog microelectronics
April 2005
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嵌入式系统
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